Obama: Health care progress a victory for American peopleCalculating national debt a number nerd's paradiseHeated debate again over 'War on Christmas' claimsCynthia Nixon: Abortion debate's new voiceCyber Challenge tests nation's top hackersSenate passes $636 billion defense spending billGOP rips Senate health care timelineObama announces climate change deal with China, other nationsU.S., Russia making progress on nuke deal, Obama says